John mccabt



(No Model.)

J MQGART; PISTON HEAD FOR STEAM ENGINES.

No. 357,777. Patented Feb. 1-5, 1887,,

INVENTOR Mu/mu ATTORNEYS.

taken on the line a: a; of Fig. 1.

Units STATES PATENT OFFICE.

JOHN MOOART, OF ,NEYV YORK, N. Y.

PISTON-HEAD FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 357,777, dated February 15, 1887.

Application filed August 17,18St. Serial No. 211,145. (No model.)

To (tZZ whom it may concern:

. Be it known that I, JOHN MoOART, of the city, county, and State of New York, have invented a new and Improved Piston-Head for Steam-Engines, of which the following is a full, clear, and exact description.

Myinvention relatestoapiston-head packed with split metallic rings, and the invention consists in the application of the steam-checks, as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a side View of my new and im proved pistonhead. Fig. 2 is a sectional elevation of the same. Fig. 3 is a sectional view Fig. 4 is a plan View of one of the split packing-rings with its spring. Fig. 5 is a perspective view of the corrugated spring for spreading the packingrings. Fig. 6 is a detailed plan view of apart of one of the packing-rings, showing the ar-.

rangement of the steam-check at the split or opening in the ring. Fig. 7 is a sectional e1e vation of the same on the line y 3 of Fig. 6. Fig. 8 is an enlarged sectional elevation of the two packing-rings with the corrugated spreadingspring removed, and Fig. 9 is a similar View showing the said corrugated spreadingspring in place. V

In constructing my improved piston-head I employ two split packing-rings, A A, of metal. These are placed upon the body B, formed with the flange C, which latter is of an appreciable less diameter than the bore of the cylinder with which the piston-head is to be used, and the body Bissecured upon the piston-rod F in an ordinary manner, and the rings are held in place upon the body B by the annular disk D and the bolts E E, which pass through the disk and screw into screw-tapped openings i made in the body A. The annular disk D is of the same external diameter as the flange G, and the adjacent surfaces of the disk D and flange O are faced off, as shown at t" i, to form fiat and true seats for the outer edges of two packingrings, A A, which edges are also made true, to form steam-tight joints with the said seats '13 i, as hereinafter described.

The body B, between the screw-threaded openings 2', is recessed, as shown at i", to reduce the weight of the body B, and opposite each of the said screw-threaded openings i a projection or lug, i", is formed to strengthen the body B at the points where the bolts E enter it, while between these lugs or projections i the metal is removed, asshown at i to still further lessen the weight of the body and relieve it of surplus and useless metal.

The packing-rings A A are duplicates of each other, each being split diagonally at a, and are constructed to form a recess, a, inits outer edge opposite the opening or split a, to receive a small block, (I, to serve as a steanr check to prevent steam from entering the piston-head at the slit or opening a. A small lip, d, (shown clearly in Figs. 6 and 7,) isformed upon each steam-check (l, and a corresponding recess or depression, (1, is formed in the recess c, to-reccive the lip 01, for holding the steam-check in p1ace,and the steanrchecks are of slightly less length than recesses a, so the said checks will permit longitudinal movement of the parts due to opening and closing ofthe split rings.

Upon the inner surfaces ofthe packing-rings A are formed the lugs or bars I), and a circular spring, G, is fitted within each ring, which acts to expand the ring. The springs G are endless, or ringsprings, and are corrugated in such a manner as to bear upon the lugs or bars I), and also upon the inner surface of the rings between the lugs or ribs, as shown in Fig. 4, so that the springs may be readily introduced into the rings, and so that the outward or opening pressure of the springs will be equal at all parts of the packing-rings.

Between thetwopacking-rings AA is placed the corrugated spring H, the corrugations or waves of which form oppositesmall curved springs, which are compressed when the bolts E-E are tightly screwed down, so that these small curved springs act constantly to spread the packing-rings A A apart, which results in forcing the outer fiat surfaces of the said rings against the flat seats '5 i of the flange O and disk D, thus forming steam-tight joints between the packing-rings and the adjoining surfaces of the said flange and disk, so that no The ring A, slotted at a, and formed at the slot upon the inside, with the recess a, lip d, and depression d in combination with the 15 steam-check d, of less length than the recess a, and grooved to fit over thelip d, substantially as described.

JOHN MOOART.

W'itn esses O. SEDGWICK, A. E. BRINKERHOFF. 

